... / H 3.The big or small fog by rotating the switch to control Description for Ultrasonic humidifier : 1,Energy-saving circuitry devising ... , humidifier started work.; 3,The big or small fog by rotating the switch to control, convenient operation; 4,Max fog can ... ,Activated carbon filter; 6, Automatic water cut-off protection device; 2012 Hot sale ultrasonic cool mist humidifier for home, office and car